Compressor for refrigerators or the like



May '3; 1927.

4 s. MIDDENDORF COMPRESSOR FOR REFRIGERATORS OR THE LIKE Filed Aug. 2 s, 1925 Patented May 3, 1927.

* UNET a sa r GEORGE MIDDENDORF, OF NEWARK, NEW JERSEY.

COMPRESSOR FOR REFRIGERATORS OR THE LIKE.

Application filed August as, 1925. Serial No. 53,038.

This invention relates to compressors, particularly designed for refrigerator plants, and has for its object to provide a construction, which will be comparatively simple and effective and which will be especially advantageous for home use.

The apparatus is particularly adapted for the compression of sulphuric dioxide, methyl chloride or the like.

According to my invention, the compressor comprises a cylinder having an inlet ant. an outlet at its opposite ends, and a rotary spindle extending centrally and longitudlnally therethrough, and which is formed with a plurality of sets of'fan-like members or blades projecting at comparatively short intervals from the circumference thereof and arranged in such a position that, when the spindle revolves in a certain direction, a suction action will be exerted in the directlon from the inlet toward the outlet end of the cylinder. The outlet end of the latter communicates with a chamber, coil or pipe of considerably smaller volume than the cylinder, so that the gaseous fluid sucked into the cylinder by said blades will be compressed in said chamber, coil or pipe. In

refrigerator plants, said compressor coil is externally cooled, as a result of which the gaseous fluid compressed therein becomes liquefied. The liquid fluid then, as usual, evaporates through the expansion valve and returns to the refrigerator coil in gaseous form, whence it is again sucked into the compressor cylinder. 7

My invention will be more fully understood from the following detailed description by reference to the accompanying draw ing in which similar reference charactersdenote corresponding parts and in which Fig. 1 is a longitudinal vertical section of the compressor; Fig. 2 a cross-section on line 22 of Fig. 1 and Fig. 3 a diagrammatic view of a complete refrigerating plant employing my compressor.

In the drawing, 10 denotes a tube or cylinder adapted to be supported in longitudinal, horizontal position on a suitable support or'frame 11. Extending centrally and longitudinally through said tube, is a shaft 12 adapted to be driven from a suitable source of power (not shown). This shaft is centered and rotatively supported by ball bearings 13, 14 in end bushings 15, 16, which may be screwed or otherwise fixed to the ends of the cylinder 10. Formed integrally with or fixed to said shaft at intervals, are members 17 each formed with comparatively long screw curved passages 17 and the outer end edges of which are cylindrically curved and terminate close to the inner 7 face of said cylinder. These passages'will when the shaft is revolved in a certain direction produce a relatively strong suction action in the direction from the inlet end of the cylinder toward the outlet end thereof, so that the fluid drawn alternately through said passage and the spaces between the ad]acent members 17 will become graduallyv compressed without causing any overheating.

The inlet opening 18 of the cylinder "is adapted to communicate through a pipe 19 with a chamber or coil 20 containing the gaseous fluid and provided in the refrigerating chamber 21. The outlet opening 22 is adapted to communicate through a pipe 23 with a cooling chamber or coil 24, whose volume is considerably smaller than that of' the cylinder. The opposite end of the latter is connected through a pipe 25 to the other end of the refrigerating coil and is provided with a suitable expansion valve 26 of well-known construction. 27 denotes a cock or valve through which the gaseous fluid may be charged into the apparatus. I, I

7 When the shaft 12 is revolved with great speed, the screw-curved passage 17 the gaseous substance, such as sulphuric dioxide, from the refrigerating coil 20 into the cylinder 10 and compressing thesame will suck will force it into the cooling coil 24. in which 1 it will be converted into a liquid. Passing from the cooling coil 2 1 through the expansion valve 26, the liquefied gas will be evaporated and enter the refrigerating coil 20 again as gas. As is well known, the rapid evaporation of the liquefied gas will absorb the surrounding heat from the refrigerating room.

The above described cycle repeats itself indefinitely i. e. until a new charge of gaseous fluid is required. 7 7

What I claim is A compressor for gaseous fluids or the like,

consisting of a cylinder tightly closed at both ends and having an inlet and outlet near its.

plurality of spaced members fixed on said 7 shaft and snugly fittingin said cylinder,

each member being formed witha set of comparatively long and narrow screw curved passages whereby during the rotation of said shaft the fluid will be drawn alternately through saidpassages and the spaces between said inenibers and become gradually 10 compressed without causing overheating. In testimony whereof I afiix my signature.

GEORGE MIDDENDORF. 

